Gearing.



No. 811,751. PATENTED FEB. a, 1906. F. M. STAMBAUGH.

GBARING.

arruoumn rum) 11.4301. 1905.

2 SHEETS-SHEET l ATTEST. 1N \IEZNTOR.

FRAwms. M. STAMBAUGH.

ATTY s No. 811,751. PATENTED FEB. 6, 1906.

P. M. STAMBAUGH.

GEARING.

APPLIGATIOK FILED HAHHI. 1905 2 BHBETB -BHBET 2.

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FRANCIS M. STAMBAUGH.

UN ITED STATES FRANCIS M STAMBAUGQ. OF ST. LOUIS, MISSOURI, ASSIGNOR TOTHE AlVlEltlOAN BRAKE COMPANY, OF ST. LOUIS, M ISSOURI, A CORPORA- T IONOF MISSOURI.

GEAFHNG.

Specification of Letters Patent.

Patented Feb. 6, 1906.

1'0 all whom it ntrty concern.-

Be it known that I ,FRANoIs M. STAMBAUGU, a citizen of the UnitedStates, residing at St. Louis, Missouri, have invented a certain new anduseful Improvement in Gearing, of which the following is a full, clear,and exact descri ition, such as will enable others skilled in the art towhich it appertains to make and. use the same, reference being had tothe accompanying drawings, forming part of this specication, in whichFigure 1 is a side elevational view of my improved machine. Fig. 2 is asectional view on line 2 2 of Fig. 1. Fig. 3 is a sectional view on line3 3 of Fig. 2, and Fig. 4 is a to plan view of the parts shown in Fig.3.

This invention relates to a new and useful improvement in a machine forassembling part of a slack adjuster, particularly the clevis on thethreaded rod, the object being to firmly screw the clevis onto the rodwhile the rod is held in a vise and by so forcibly driving the clevishome avoid the use of cross pins or keys for permanently connecting theclevis to the rod. Heretofore these parts have been assembled by handbut it is obvious that the ap lication of manual power to force theclevis ome is not only tiresome, but the length of thewrenchdiarnecessary to apply the required power to the clevis renders such manualassemblage awkward.

My present invention consists in the construction, arrangement, andcombination of the several parts, all as will hereinafter be de scribed,and afterward pointed out in the claim.

In the drawings, 1 indicates a frame carrying a stationary visej aw 2,preferably faced with Babbitt metal, so as to avoid mutilation of thethreads of the rod 3, which is clamped thereon and upon the end of whicha clevis 4 is to be secured.

5 indicates a movable vise-jaw, also faced with Babbitt metal where itengages the rod 3, said movable jaw being carried by a crosshead 6,connected to rods 7, assing down through suitable guides on the ame I.The lower ends of these rods 7 are ivotally connected to iinks 8,forming mem ers of a compound toggle, said links 8 being pivotallyconnected at the connecting-points of levers 9, having fixed fulcrums onparts of the frame I, while levers 10 are connected to a pistonrod II.Rod. 11 has a head at its upper end operating in a cylinder 12, underwhich is an ranged a spring 13. A pipe 14, leading from some suitablesource of compressed-air supply, is provided with a three-way valve 15,whereby pressure is admitted to and exhausted from the cylinder abovethe head of the piston.

16 indicates a pulley having a friction-face, with which cooperates afriction-clutch 17.

Pulley 16 is loosely mounted on shaft 18,,

while the clutch is keyed to said shaft and longitudinally movable withrespect thereto.

19 indicates a spring follower slidingly mounted on shaft 18 and bearingagainst a spring 20, whereby yielding .ressure may be exerted againstthe friction-c utch I7. Afoot treadle 21 is designed to be operated bythe operator in yieldingly pressing the clutch 17 against thefriction-face of the pulley. Shaft 18 is provided with a pinion 22,meshing with a gear 23, whose shaft is provided with a ton 'ued mandrel24.

The operation is as follows: The clevis is first introduced onto thetongue of the man drel, which normally is at rest. The threaded bar 3 isnow placed between the vise-j awe and adjusted in the proper position.The tapped opening in the clevis for receiving the bar 3 is preferablytapered-slightly, so that the clevis can he firmly driven home. When thebar 3 is in position, valve 15 is operated to admit pressure on top ofthe piston, which transmits motion through the compound to gle leverageto the movable viseaw, firm y clamping the rod 3 in position, the powerapplied to the vise-jaw and the extended area of said jaws preventingthe rod 3 from being rotated during the time that the clevis is beingsecured in position thereon. The operator now de resses the treadle 21,with a result that t e mandrel 24 is rotated in the proper direction toscrew the clevis onto the rod 3, the operator of course properlyadjusting the clevis so that its tapped opening wiil receive thethreaded end of rod 3. The clevis will be screwed home until the taperedopen ing prevents further movement eXce t by the a piication of greaterpower, and ierein lies th s value of the yielding pressure on thefriction clutch. The operator usually depresses the treadle 21 by foot,and the greater the weight applied. to the treadle the greater will bethe frictional contact between the clutch faces, and conse uently thegreater amount of power applied. In practice the operator practicallyputs most of his weight on the treadle, a heavy person of course causinthe clevis to be more firmly seated home. Wlaen the clevis is seatedhome, it comes to a position of rest, indicating that it has beenscrewed in position as far upon the rod 3 as the power applied to thetreadle 21 warrants, and thereupon the operator releases the treadle andexhausts the air from on to) of the cylinder, the spring 13 raising there 11 and the movable vise-jaw enabling the 0 erator to remove the rod 3and its attac ed clevis from the machine.

I am aware that minor changes in the construction, arrangement, andcombination of the several parts of my device can be made andsubstituted for those herein shown and described without in the leastdeparting from the nature and princi 1c of my invention.

Having thus descri ed my invention, what I claim as new, and desire tosecure by Let ters Patent, is

In a machine of the class described, a mandrel, a shaft on which saidmandrel is mounted, a gear on said shaft, a drive-shaft, a pinionthereon that meshes with said gear, a loose ulley mounted on saiddrive-shaft and rovi ed with a friction-face, a clutch memer splinecl tosaid shaft and having a cooperating friction-face, a followerreciprocatingly mounted on the drive-shaft, a spring surrounding thedrive-shaft and interposed between the follower and the clutch member,and a lever in engagement with said follower and adapted to be actuatedfor moving the clutch member into engagement with the loose pulley andholding it there with a yielding pressure; substantially as described.

11 testimony whereof I hereunto afiix my signature, in the presence oftwo witnesses, this 3d day of March, 1905.

F RANOIS M. STAMBAUGH.

Witnesses:

EDWARD WILSON, GEORGE BAKEWELL.

